Add radio embed widget, SSE real-time, song history, moderation panel, and Auto DJ

- Embed widget: standalone iframe player with dark/light/transparent themes, copy-paste embed code admin page
- Real-time SSE: streaming now-playing/listeners/dj events, replaces polling in radio-player and embed
- Song history: auto-records song changes to radio_song_plays table, Filament resource to view
- DJ moderation: unified panel for shouts approval, song request queue, DJ applications
- Auto DJ: playlist management with round-robin playback when no DJ is live
- Refactored radio-player Alpine component to use EventSource API with auto-reconnect

app/Enums/RadioSettings.php

@@ -20,6 +20,12 @@ enum RadioSettings: string
     case WidgetEnabled = 'radio_widget_enabled';
     case WidgetShowGlobally = 'radio_widget_show_globally';
     case WidgetPosition = 'radio_widget_position';
+    case EmbedEnabled = 'radio_embed_enabled';
+    case EmbedAllowedDomains = 'radio_embed_allowed_domains';
+    case EmbedTheme = 'radio_embed_theme';
+    case EmbedHeight = 'radio_embed_height';
+    case EmbedWidth = 'radio_embed_width';
+    case EmbedAutoPlay = 'radio_embed_auto_play';
 
     public function label(): string
     {
@@ -40,6 +46,12 @@ enum RadioSettings: string
             self::WidgetEnabled => 'Widget Enabled',
             self::WidgetShowGlobally => 'Widget Show Globally',
             self::WidgetPosition => 'Widget Position',
+            self::EmbedEnabled => 'Embed Enabled',
+            self::EmbedAllowedDomains => 'Embed Allowed Domains',
+            self::EmbedTheme => 'Embed Theme',
+            self::EmbedHeight => 'Embed Height',
+            self::EmbedWidth => 'Embed Width',
+            self::EmbedAutoPlay => 'Embed Auto Play',
         };
     }
 }